Question about LaserBee HLPM-II (Meter)

I'm new to high powered lasers, and I just got a cheap LaserBee meter. How accurate is this meter normally? Everything seems to be reading very high!

I first tested my 7 year old green pointer, after the conversion it reads as 11mW output (possible).
I then tested my WL 100mW green. The paper I got with it quotes it as 120 peak, 108 average. This meter reads it as 130mW, before the 1.63 multiplier!
What am I doing wrong? Or is my laser really double spec? (195mw)

"The HLPM uses 655nm Laser Diode Module as the reference wavelength. Using
the spectral sensitivity characteristic conversion table below of the most common wavelengths, rough readings can be taken from 405nm to 1000nm."

Wavelength (nm) Correction Factor
405 x 23.3 (typo? 2.33?)
473 x 2.06
488 x 1.99
532 x 1.63
633 x 1.05
655 x 1.00
780 x 0.78
808 x 0.69
980 x 0.96
1000 x 1.01

Key being "rough" - you get what you pay for. Readings can be greatly influenced if the entire beam isn't exactly centered on the photodiode, or if the laser leaks any IR.

I recommend against optical power meters, even from a company like Coherent - they're just notorious for being inaccurate.

I'd look into a thermal based LPM. If you don't need it immediately, I am developing something in the relatively near future you may be interested in.

Hope that helps.